Answer:
No, bricks are not made only from clay. While clay is a common material used in brickmaking, bricks can also be made from other materials or a combination of materials. Here are some examples:
Step-by-step explanation:
1. Clay bricks: Clay is the traditional material used for brickmaking. It is abundant, easily sourced, and has desirable properties such as strength and durability. Clay bricks are typically made by shaping the clay into rectangular forms and then firing them in a kiln to harden.
2. Concrete bricks: Concrete is a mixture of cement, aggregates (such as sand or crushed stone), and water. Concrete bricks are made by pouring a mixture of these ingredients into molds and allowing them to cure or harden. They can have different finishes and textures.
3. Fly ash bricks: Fly ash is a byproduct of coal combustion in power plants. It can be used as a substitute for clay in brickmaking. Fly ash bricks are made by combining fly ash, sand, and a binding agent, and then compressing them into molds. They are known for their strength and thermal properties.
4. Sand-lime bricks: Sand-lime bricks are made by mixing sand, lime, and water. The mixture is then pressed into molds and cured under high pressure and temperature. These bricks are known for their high strength and resistance to moisture.
5. Autoclaved aerated concrete (AAC) bricks: AAC bricks are made from a mixture of cement, lime, sand, and water. The mixture is aerated using a foaming agent, and then cured in an autoclave, which creates air pockets in the brick. AAC bricks are lightweight, have good insulation properties, and are used for construction purposes.
These are just a few examples of the different types of bricks that can be made from materials other than clay. The choice of material depends on factors such as availability, cost, desired properties, and intended use of the bricks.